 In ENGLISH, the use of conjunctions in compound sentences will NEVER utilize the subjunctive.  I’ll take my umbrella in case it rains.

 But in SPANISH, they are followed by the SUBJUNCTIVE.  Traeré mi paraguas en caso de que llueva.

 Always use the subjunctive after the following conjunctions because they express doubt or uncertainty about whether or not the events in the second part of the sentence will happen.

 a fin de que  a menos que  antes de que  con tal de que  en caso de que  para que  sin que  so that  unless  before  provided that  in case that (in the event that)  so that (in order that)  without

 No gastes tus ahorros a menos que sea necesario.  Don’t spend your savings unless it’s necessary.  Voy a imprimir las fotos para que todos las miren.  I’m going to print the photos so that everyone can look at them.

 Conjunctions without “que” = indicative  Tendrás que comer antes de que salgas.  Tendrás que comer antes de salir.